Welcome to HVAC-Talk.com, a non-DIY site and the ultimate Source for HVAC Information & Knowledge Sharing for the industry professional! Here you can join over 150,000 HVAC Professionals & enthusiasts from around the world discussing all things related to HVAC/R. You are currently viewing as a NON-REGISTERED guest which gives you limited access to view discussions

To gain full access to our forums you must register; for a free account. As a registered Guest you will be able to:

Participate in over 40 different forums and search/browse from nearly 3 million posts.

curious question about duration of cycle on heat pump

the outdoor ambient temperature is below freezing, as low as 28F, average around 30F
indoor target 64F (set away), looks like heat pump is keeping up with the heat.

i am seeing a consistent, repeating pattern of heat pump cycle on 16 minutes , off for 30 minutes, then cycle on 32 minutes (2x longer), then off for 30 minutes, then cycle on 16 minutes, then off 30 minutes, then cycle on 32 minutes. it seem to be a repeating pattern.

i am away from home, can't tell if compressor is in deep defrosted cycle and blower kept blowing cold air into house, according to the log, it seem like indoor temperature drop 1F during that same time, but if it is defrosting, why is it only happening every OTHER cycles?

i don't have heating strip, the aux heat is propane furnace, and the DIFF is 3F.

i did asked my installer, and he said this unit has auto defrost with sensor.
i am leaned more toward to low temperature and high humidity at the time.
this defrost cycle has stopped around 12 noon today.
i will go home soon, so i just raised the temperature by 2F, and it seem like heat pump ran for 30 minutes and reached the target with out any drop of indoor temperature while the whole time HP was running,
today weather, full sun since 10am this morning, at 3pm currently 31F sunny, NW 10mph wind, 35% humidity.